68060 Overclocking

Hewitson · 11 January 2008, 03:18

I will be receiving a 1260 shortly, and planned to run it @66mhz, do you think it is a good idea to run at 80mhz in a standard case or not? I imagine it would get too hot with the cpu running at nearly twice its intended speed with next to no ventilation

Any advice would be appreciated

Thanks

coze · 11 January 2008, 03:30

advice ? don't do it ! you'll definitely burn your card.

Zetr0 · 11 January 2008, 03:35

@Braddo

Sounds like a great project

, I would suggest that you take small incremental steps in over-clocking the 060, try it in three step increments.

Its best to advise you to use an active cooling solution (heatsink / fan) and power these independently from the PSU.

By the way, what 1260 are you going to overclock ? apollo / Blizzard

some cpu masks and revisions dont clock all that well, some don't clock at all and yet some clock at 100mhz, however this will be trial and error. the cooler you can keep the chip the more you could be able to clock it..

for the Higher clock speeds you may have to sacrifice the FPU and or MMU as these dont overly tolerate higher clock speeds.

on a final note, remember that the more frequency you want out of it, the more power you must put into it...

the 060 has a tollerance of 3.2 to 4.5 volts. the latter being if you are going to clock it at 80Mhz. if you need a pdf of the 060 it will give you not only the thermal outputs but also the power to frequency request... hence more power = more active cooling.

you will need to get faster timming memory as well.... try and get 60ns of faster 50ns memory.

Oh and one last thing....

PLEASE take pics.... these projects are needed for the masses... to see, to inspire and to dream

Hardware Pr0n for the win!!!

Hewitson · 11 January 2008, 07:07

Yeah I'll be using a fan, won't be independantly powered, but I'm using a 500 psu so that should be fine. Its an Apollo card, mask 71E41J cpu. PG has tested @80mhz and says it runs fine, I'm just worried about running it at that speed because of the lack of ventilation in the A1200 case.

If it's at 80 it'll be running at 4.5v? That doesn't sound too good.. I think I'll keep it at 66. And yeah, the memory is 60ns.

When I receive the card I'll take a couple of pics for ya

Cheers

Zetr0 · 11 January 2008, 07:26

@Braddo

66mhz is a wise decision considering it being in the a1200 desktop!

@80mhz according to the specs from Freescale the 060 will be drawing upto 4.5volts... so all the voltage regulators will likely be over tolerance... by around 20 %

Per Gunnar certainly knows his stuff my friend. and in any info apollo related i would differ to him!

query him about the heat.. and how it will handle being in a desktop compared to a tower....

alexh · 11 January 2008, 15:40

Seems fine to me, the MC68060RC50 with the mask E41J (i.e. v6) can be overclocked to 100MHz on the CT60 turbo cards for Atari Falcon's (which have SDRAM).

The quality/speed of your RAM will determine the maximum STABLE speed of your card.

My MC68060RC50 @ 50MHz runs almost cold with no heatsink or fan.

Charlie · 13 January 2008, 19:27

Um,
I've got a blizzard '060 - I guess the layout is much the same...
...cpu facing down.

What I did to (hopefully) ensure good cooling in a desktop case is:
-Carefully(ish) drill a bunch of holes into the trapdoor so it looks somewhat like a colander.
-Get some bigger rubber feet for the A1200
-Attach a good slimline heatsink that will take a fan to the cpu.
-Swear because you can't close the trapdoor anymore...
-...Carefully(ish) cut a hole for the heatsink to poke through - join the dots.
-Attach v. slim fan to the heatsink set to blow into the case.

Hopefully that should get you some reasonable airflow for the 'hot bits' without the need to towerise.

TBH: I backed it off again & removed the fan, not because it didn't work but because the SCSI give up @ higher clock rates.
Mind you the Apollo SCSI is so bad (I believe) I guess that won't bother you.

DDNI · 13 January 2008, 19:38

I have my 71E41J running at 64mhz in my BPPC. Any faster and SCSI plays up.

As it is my amiga doesnt boot immediately,On initial power up I have to enter the Amiga early start menu then boot from there... After that though any soft resets work perfectly. Overclocking always seems to bring timings issues!

cv643d · 14 January 2008, 18:50

Apollo has the 060 on the reversed side so you can mount a slightly bigger heatsink on those.

15 January 2008, 00:17

OK I have a question about this. I recently got myself a blizzard 1260. How do you guys put a heatsink on the cpu. mine has the ram module overlapping onto the cpu. Do you just put the heatsink on the cpu in a "shifted" position. or do you go ahead and change the simm slot to a vertical one (which would again mean "not fitting" inside the original case)

Yep I would prefer not to towerize

Zetr0 · 15 January 2008, 01:15

hmmmm.... this could be a serious problem if you want to cool the 060 from overclocking... you could get some wafer thin heating and use passive cooling.

Charlie · 15 January 2008, 15:34

I've seen off-center heatsinks on the web (quite common in fact) and heard no complaints about it...
...so I assume it is 'safe'.
Having said that it must be far from ideal.

FWIW: I'm in the fortunate position of my ram stick being slim enough that I can (just) get a not-quite full-width heatsink to fit properly.
It's a pain but for added safety (such hardware is getting harder to replace) I'd suggest finding some ram that allows more room if either heat is a problem of you're considering pushing those mhz.

You can save a little room by using a passive-style 486 or northbridge heastink & gluing it to the CPU rather than clipping. (A fan then becomes the next problem)
What I would say is if you have any doubts - don't.

If you must:
Get the best thermal goop you can.
(arctic silver or coollaboratory liquid pro if feeling brave)
Adhesive pads or thermal glue are ok but not 'the best' especailly if you're concerned about marginal cooling arrangements.
How to stick?
-Apply the thinnest even layer of your fav goo that you can.
-Apply the heatsink to the cpu.
-Holding the card press down firmly between thumb & fingers.
-Take a tube of superglue (the gel stuff is easier).
-Apply a SMALL dot to two opposite corners where the heatsink meets the CPU.
-Keep on the pressure until you're sure the glue has dried.

You get:
Best thermal solution
No glue between heatsink & cpu (important for cooling)
No bulky HS attachement
The glue will hold the heatsink
You didn't use so much that it will never come off!

Hewitson · 24 January 2008, 13:30

Quote:

Originally Posted by alexh

Seems fine to me, the MC68060RC50 with the mask E41J (i.e. v6) can be overclocked to 100MHz on the CT60 turbo cards for Atari Falcon's (which have SDRAM).

The quality/speed of your RAM will determine the maximum STABLE speed of your card.

My MC68060RC50 @ 50MHz runs almost cold with no heatsink or fan.

Almost cold? Mine is almost too hot to touch @ 66mhz, and thats with a fan!

alexh · 24 January 2008, 13:51

Sounds like you might not have MC68060RC50, Mask E41J, Revision 6. (Maybe an earlier version or a faked one)

Easy to tell, you can use the CPU060 command to get it to tell you which version it is (from the PCR register).

http://eab.abime.net/showpost.php?p=295454&postcount=9

An E41J version will have Revision 6.

Please post your results.

Hewitson · 24 January 2008, 14:49

Quote:

Originally Posted by alexh

Sounds like you might not have MC68060RC50, Mask E41J, Revision 6. (Maybe an earlier version or a faked one)

Easy to tell, you can use the CPU060 command to get it to tell you which version it is (from the PCR register).

http://eab.abime.net/showpost.php?p=295454&postcount=9

An E41J version will have Revision 6.

Please post your results.

CPU060 does report it as a Revision 6, and it does have E41J printed on the CPU. Keep in mind its not a very good fan, and only covers about half of the chip. I may drop it down to 50 and see how the temperature goes.

alexh · 24 January 2008, 16:17

Ok, there were some fake E41J chips floating around which were older ones which had been rebadged.

Mine when you put your finger on it, you could only just detect a temperature. That said I've not tried it for a long time, perhaps I am remembering incorrectly.

The same chip ran stable at 100MHz (albeit with heatsink and fan) in an Atari CT60 when I loaned it to a mate.

Perhaps the 1260 voltage is slightly higher than my CS MKIII?

Hewitson · 24 January 2008, 16:26

It must be unfortunately. Obviously your card is a much better one for overclocking, I don't think I'd dare to run mine at 80mhz after feeling how hot it is at 66.

Hopefully a better fan will do the job, unfortunately I don't think theres enough room for a heatsink as well. Maybe a heatsink would be better than a fan?

alexh · 24 January 2008, 16:30

I doubt it, but perhaps the modification didnt work and it is running at 5v? Nah, surely it would have died by now?!

Zetr0 · 24 January 2008, 16:44

@Alexh

going over the spec sheet from freescale... it states the 060 can handle 5v for frequencies upto 75mhz

i dont think it would do your FPU / MMU any good at that voltage though

Hewitson · 25 January 2008, 00:26

PG tested @80mhz and said it worked fine, unfortunately I don't have a multimeter to test but I doubt the regulator isn't working. His work is of an incredibly high standard.

11 January 2008, 03:18	#1
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	68060 Overclocking I will be receiving a 1260 shortly, and planned to run it @66mhz, do you think it is a good idea to run at 80mhz in a standard case or not? I imagine it would get too hot with the cpu running at nearly twice its intended speed with next to no ventilation Any advice would be appreciated Thanks

24 January 2008, 13:51	#14
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,461	Sounds like you might not have MC68060RC50, Mask E41J, Revision 6. (Maybe an earlier version or a faked one) Easy to tell, you can use the CPU060 command to get it to tell you which version it is (from the PCR register). http://eab.abime.net/showpost.php?p=295454&postcount=9 An E41J version will have Revision 6. Please post your results. Last edited by alexh; 24 January 2008 at 14:05.

24 January 2008, 16:17	#16
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,461	Ok, there were some fake E41J chips floating around which were older ones which had been rebadged. Mine when you put your finger on it, you could only just detect a temperature. That said I've not tried it for a long time, perhaps I am remembering incorrectly. The same chip ran stable at 100MHz (albeit with heatsink and fan) in an Atari CT60 when I loaned it to a mate. Perhaps the 1260 voltage is slightly higher than my CS MKIII? Last edited by alexh; 24 January 2008 at 16:25.

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11 January 2008, 03:30	#2
coze hastala vista winny vista Join Date: Feb 2006 Location: mt fuji Age: 46 Posts: 1,335	advice ? don't do it ! you'll definitely burn your card.

11 January 2008, 03:35	#3
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Braddo Sounds like a great project , I would suggest that you take small incremental steps in over-clocking the 060, try it in three step increments. Its best to advise you to use an active cooling solution (heatsink / fan) and power these independently from the PSU. By the way, what 1260 are you going to overclock ? apollo / Blizzard some cpu masks and revisions dont clock all that well, some don't clock at all and yet some clock at 100mhz, however this will be trial and error. the cooler you can keep the chip the more you could be able to clock it.. for the Higher clock speeds you may have to sacrifice the FPU and or MMU as these dont overly tolerate higher clock speeds. on a final note, remember that the more frequency you want out of it, the more power you must put into it... the 060 has a tollerance of 3.2 to 4.5 volts. the latter being if you are going to clock it at 80Mhz. if you need a pdf of the 060 it will give you not only the thermal outputs but also the power to frequency request... hence more power = more active cooling. you will need to get faster timming memory as well.... try and get 60ns of faster 50ns memory. Oh and one last thing.... PLEASE take pics.... these projects are needed for the masses... to see, to inspire and to dream Hardware Pr0n for the win!!!

11 January 2008, 07:07	#4
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	Yeah I'll be using a fan, won't be independantly powered, but I'm using a 500 psu so that should be fine. Its an Apollo card, mask 71E41J cpu. PG has tested @80mhz and says it runs fine, I'm just worried about running it at that speed because of the lack of ventilation in the A1200 case. If it's at 80 it'll be running at 4.5v? That doesn't sound too good.. I think I'll keep it at 66. And yeah, the memory is 60ns. When I receive the card I'll take a couple of pics for ya Cheers

11 January 2008, 07:26	#5
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Braddo 66mhz is a wise decision considering it being in the a1200 desktop! @80mhz according to the specs from Freescale the 060 will be drawing upto 4.5volts... so all the voltage regulators will likely be over tolerance... by around 20 % Per Gunnar certainly knows his stuff my friend. and in any info apollo related i would differ to him! query him about the heat.. and how it will handle being in a desktop compared to a tower....

11 January 2008, 15:40	#6
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,461	Seems fine to me, the MC68060RC50 with the mask E41J (i.e. v6) can be overclocked to 100MHz on the CT60 turbo cards for Atari Falcon's (which have SDRAM). The quality/speed of your RAM will determine the maximum STABLE speed of your card. My MC68060RC50 @ 50MHz runs almost cold with no heatsink or fan.

13 January 2008, 19:27	#7
Charlie . . Mouse . . Join Date: Jun 2005 Location: Nowhere Age: 55 Posts: 1,792	Um, I've got a blizzard '060 - I guess the layout is much the same... ...cpu facing down. What I did to (hopefully) ensure good cooling in a desktop case is: -Carefully(ish) drill a bunch of holes into the trapdoor so it looks somewhat like a colander. -Get some bigger rubber feet for the A1200 -Attach a good slimline heatsink that will take a fan to the cpu. -Swear because you can't close the trapdoor anymore... -...Carefully(ish) cut a hole for the heatsink to poke through - join the dots. -Attach v. slim fan to the heatsink set to blow into the case. Hopefully that should get you some reasonable airflow for the 'hot bits' without the need to towerise. TBH: I backed it off again & removed the fan, not because it didn't work but because the SCSI give up @ higher clock rates. Mind you the Apollo SCSI is so bad (I believe) I guess that won't bother you.

13 January 2008, 19:38	#8
DDNI Targ Explorer Join Date: Mar 2006 Location: Northern Ireland Posts: 5,433	I have my 71E41J running at 64mhz in my BPPC. Any faster and SCSI plays up. As it is my amiga doesnt boot immediately,On initial power up I have to enter the Amiga early start menu then boot from there... After that though any soft resets work perfectly. Overclocking always seems to bring timings issues!

14 January 2008, 18:50	#9
cv643d Registered User Join Date: Jul 2002 Location: Sweden Posts: 762	Apollo has the 060 on the reversed side so you can mount a slightly bigger heatsink on those.

15 January 2008, 00:17	#10
nightlord Posts: n/a	OK I have a question about this. I recently got myself a blizzard 1260. How do you guys put a heatsink on the cpu. mine has the ram module overlapping onto the cpu. Do you just put the heatsink on the cpu in a "shifted" position. or do you go ahead and change the simm slot to a vertical one (which would again mean "not fitting" inside the original case) Yep I would prefer not to towerize

15 January 2008, 01:15	#11
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	hmmmm.... this could be a serious problem if you want to cool the 060 from overclocking... you could get some wafer thin heating and use passive cooling.

15 January 2008, 15:34	#12
Charlie . . Mouse . . Join Date: Jun 2005 Location: Nowhere Age: 55 Posts: 1,792	I've seen off-center heatsinks on the web (quite common in fact) and heard no complaints about it... ...so I assume it is 'safe'. Having said that it must be far from ideal. FWIW: I'm in the fortunate position of my ram stick being slim enough that I can (just) get a not-quite full-width heatsink to fit properly. It's a pain but for added safety (such hardware is getting harder to replace) I'd suggest finding some ram that allows more room if either heat is a problem of you're considering pushing those mhz. You can save a little room by using a passive-style 486 or northbridge heastink & gluing it to the CPU rather than clipping. (A fan then becomes the next problem) What I would say is if you have any doubts - don't. If you must: Get the best thermal goop you can. (arctic silver or coollaboratory liquid pro if feeling brave) Adhesive pads or thermal glue are ok but not 'the best' especailly if you're concerned about marginal cooling arrangements. How to stick? -Apply the thinnest even layer of your fav goo that you can. -Apply the heatsink to the cpu. -Holding the card press down firmly between thumb & fingers. -Take a tube of superglue (the gel stuff is easier). -Apply a SMALL dot to two opposite corners where the heatsink meets the CPU. -Keep on the pressure until you're sure the glue has dried. You get: Best thermal solution No glue between heatsink & cpu (important for cooling) No bulky HS attachement The glue will hold the heatsink You didn't use so much that it will never come off!

24 January 2008, 16:26	#17
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	It must be unfortunately. Obviously your card is a much better one for overclocking, I don't think I'd dare to run mine at 80mhz after feeling how hot it is at 66. Hopefully a better fan will do the job, unfortunately I don't think theres enough room for a heatsink as well. Maybe a heatsink would be better than a fan?

24 January 2008, 16:30	#18
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,461	I doubt it, but perhaps the modification didnt work and it is running at 5v? Nah, surely it would have died by now?!

24 January 2008, 16:44	#19
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Alexh going over the spec sheet from freescale... it states the 060 can handle 5v for frequencies upto 75mhz i dont think it would do your FPU / MMU any good at that voltage though

25 January 2008, 00:26	#20
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	PG tested @80mhz and said it worked fine, unfortunately I don't have a multimeter to test but I doubt the regulator isn't working. His work is of an incredibly high standard.

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